vector drawings of discovered SUs. The combined use of TS measurements and orthoimages assured high accuracy and
correspondence between diferent drawings, in order to improve the accuracy of traditional plans and sections realized during
ieldworks Fig. 4. Vector drawing can be equally managed in software like AutoCAD
©
or GIS, being both points and orthophotos georeferenced. Points helped in individuating the
features where not clearly visible on images, a very common issue especially for what concerns deposits. 2D outputs are
important also because are explicitly required by the Italian regulations about archaeological ieldworks.
4.2.2 Deposits and Interface Modelling
Since one of the aim was trying to reach a surveying approach focused on 3D objects, a possible digital modelling of
archaeological evidence has been planned using collected ield data. Three-dimensional representation of archaeological
stratigraphy is a long-standing topic connected to digital surveying Alvey, 1993. Many solutions have been proposed to record the
third dimension of deposits, such as the creation of a triangulated irregular network TIN from a TS point grid D’Andrea and
Barbarino, 2012; Putzolu et al., 2002; the use of meshes coming from laser scanner surveys De Felice et al., 2008, from laser
scanner and photogrammetric surveys Berggren et al., 2015; Forte, 2014, or only from digital photogrammetry Poggi, 2016;
Roosevelt et al., 2015. In this case, a diferent approach has been tested.
Point clouds generated from photogrammetric projects of single SUs have been imported in a software for digital modelling
Rhinoceros© together with drawn vector boundaries. Since the used reference system was unique, all the outputs are correctly
georeferenced without any further operation. Point clouds and vectors have been used to generate a NURBS Non Uniform
Rational Basis Splines; Piegl and Tiller 1997 surface. Additional tests performed with the software CloudCompare have proved a
good correspondence between original point clouds and new surfaces; obtained results showed that the 98.5 of checked
values surfaces are included within an error of 1 cm for sub- planar, the 96.2 for non sub-planar surfaces.
Figure 4. Vector drawing plan on orthoimage of SUs in trench VIb, in front of church façade scalebar = 5 m.
Figure 5. A sample of three-dimensional stratigraphic sequence in trench VIb, exploded view cfr. Fig. 3.
the main datasets during the ieldworks. Raw datasets are successively used to get 2D and 3D outputs Fig. 3. Orthophotos
are used together with topographic points to obtain vector drawings which can be uploaded, together with the previous
elements, in GIS environment. Point clouds and meshes allow to obtain 3D outputs through the use of digital modelling. All
the digital outputs can be further shared and disseminated in diferent formats. Details about the methodology are presented in
the following paragraphs.
4.1 On-ield Methodology
